Search This Blog

Saturday, October 30, 2021

Flood aftermath

 0930 to 1030 on Saturday morning.  Water levels 3.3 to 3.25 feet MLW, but a lot of these show the debris left from the 4.9 foot max at midnight.  The rocks show the effects of waves breaking over the seawall, as does some of the larger pieces of wood.
























Record Flooding at Annapolis

 


https://tidesandcurrents.noaa.gov/est/Top10_form_ft.pdf


The table uses MHH, so to convert to MLLW add 1.43 feet  https://tidesandcurrents.noaa.gov/datums.html?id=8575512 


In addition to how sea level is measured, you have to be careful about the times, since many of the records for the tide gauge are in UTC (aka Greenwich or Zulu).

The local paper is reporting two prior high water marks that I cannot verify:

1.  "third-highest record of 4.98 MLLW set in 1955." NOAA says 4.583 feet on the hourly record (see the graph below), and it was Hurricane Connie.  Several NOAA listings give the height as 4.98, which I think is a typo.

2,.  "a 1993 storm ...  second-highest downtown flood recorded, with 6.17 feet above MLLW."   This is actually 1933, the Chesapeake-Potomac hurricane





Record water levels at Annapolis,  compiled from NOAA tide records.



Friday, October 29, 2021

City Dock, 5 PM News on Channel 5

 Water level at 5 PM was about 4.2 feet MLLW, with still a foot to arrive for the high tide at midnight (this was actually low tide, but the level barely changed all afternoon.

Three local TV stations were recording, and we were interviewed for channel 5 at the top of the 5 PM newscast.